Uchiha Obito

When Rin was kidnapped by the shinobis of hidden Village of Earth. Obito went behind them.Obito located the cave that those ninjas were using as their hideout, but before he could make much progress, he was found and attacked by a ninja using camouflage technique. Having a change of heart because of Obito's leaving words, Kakashi arrived and saved Obito, shielding him from the attack and losing his left eye in it. To save his team-mate, Obito awakened his Sharingan for the first time, allowing him to see through that ninja's camouflage and kill him. Those two found and rescued Rin from them, prompting Kakko to bring the cave down around them. As they made their escape, Kakashi's limited vision greatly hindered him, and when Obito noticed he was about to be crushed by a falling stone in his blind spot, he pushed him out of the way and became trapped under the stone in his place, crushing the right half of his body.

With no way to escape, Obito accepted his fate and gave Kakashi his left Sharingan as a present. Rin performed the transplant and once the transplantation was finished, Kakashi used his new Sharingan to kill Kakko. The reinforcements quickly reachede, forcing Kakashi and Rin to leave Obito behind. As the rocks tightened around him, Obito felt happy that he had finally became friends with Kakashi but was unable to confess his feelings to Rin. Minato rescued Kakashi and Rin, and Obito was believed dead, his name marked on Konoha's memorial Rock.

Obito was rescued by an elderly Uchiha madara, who found the younger Uchiha when the cave-in brought him to one of the tunnels leading to Mountains' Graveyard. Though his Sharingan was unharmed, the entire right side of his body from the neck down was completely destroyed, prompting Madara to reconstruct his body using Hashirama's cells, and secretly placing a cursed seal on Obito's heart to restrict certain actions, such as committing suicide.Telling Obito that he now owed him his life, Obito instead declared that he wanted to return to Konoha and to be with his friends. Madara informed him that his new body would prevent him from becoming a shinobi again, and that in the end it wouldn't matter. Madara talked about the harsh reality of being Ninja and all the conflicts that persisted in this shinobi World. He Told Obito that he wants to bring Peace and told about The Moon Eye Plan.Obito was least interested in that. 

As Obito was finally getting used to his new limbs, White Zetsu alerted him to the fact that Kakashi and Rin were surrounded by hidden village of Clouds and were in great danger. Obito tried to punch through the boulder blocking the exit, but destroyed his right arm in the process.[13]  As Obito prepared to leave, he told Madara he had no intention of returning, but thanked him for saving his life. Madara in turn told him that he would return willingly and thank him truthfully. Using white zetsu to locate his friends, he learned that Minato was once again absent. Upon reaching the battlefield, he was shocked to see Kakashi had pierced  through the Rin's heart with his Chidori. As Rin died before both of them, their Sharingan matured into Mangekyo

Sharingan and Kakashi passed out quickly afterwards. Enraged at Rin's death, Obito responded by using a combination of his newly-awakened Kamui and Wood Release abilities to slaughter all of the Ninjas there. Ignoring Kakashi completely, Obito took Rin's lifeless body and came back to Madara.